"Lots of CPUs cycling between 20 to 400 watts"
It's likely to provide very similar load to existing systems - it appears to be Intel's take on two cores, one die targeting HPC. Intel haven't released socket information as far as I can tell (strange...) and Intel are suggesting that systems will be liquid cooled and compute focused (i.e not supporting maximum RAM capacities).
On top of that, DC's are rarely space limited. They are either power limited (if designed correctly) or cooling limited (if it's not economic to upgrade cooling to match available power). If the DC's are power limited, you're likely just stuffing less boxes into a rack.